*{
    border: 0;
    margin: 0;
}
/*
导航栏 - 顶部、宽度100
*/
.nav{
    width: 200px;
    height: 720px;
    background-color: #3A7734;
}
.nav_title{
    top: 12px;
    left: 75px;
    position: absolute;
}
.nav_list{
    width: 200px;
    height: 670px;
    background-color: #A5D6D9;
    top: 50px;
    position: relative;
}
.nav_list_btn1{
    width: 200px;
    height: 50px;
    background-color: aqua;
}
.nav_list_btn2{
    width: 200px;
    height: 50px;
    background-color: aqua;
    top: 1px;
    position: relative;
}
.nav_list_btn3{
    width: 200px;
    height: 50px;
    background-color: aqua;
    top: 2px;
    position: relative;
}
.nav_list_btn4{
    width: 200px;
    height: 50px;
    background-color: aqua;
    top: 3px;
    position: relative;
}
/*
主面板 - 中心、宽度100
*/
.panel{
    width:1336px;
    height: 720px;
    background-color: #86989B;
    position: absolute;
    top: 0;
    left: 200px;
}
/*
标题栏 — 顶部
*/
.panel_title{
    width:1336px;
    height: 50px;
    background-color: #177199;
    position: absolute;
    top: 0;
    left: 0;
}
.panel_life{
    width:1336px;
    height: 670px;
    background-color: #9C1A1C;
    position: relative;
    top: 50px;
}
.panel_study{
    width:1336px;
    height: 670px;
    background-color: blue;
    position: relative;
    top: 50px;
}
.panel_work{
    width:1336px;
    height: 670px;
    background-color: #fafafa;
    position: relative;
    top: 50px;
}
.panel_other{
    width:1336px;
    height: 670px;
    background-color: yellowgreen;
    position: relative;
    top: 50px;
}